code: def testRegression(self):
      input = [x / 99.0 for x in range(100)]
      input.reverse()
  
      input = [x / 99.0 for x in range(100)] + input
  
      output = self.helper(input)
  
      self.assertAlmostEqual(output[0], -0.0194097850471735, 1e-6)
      self.assertAlmostEqual(output[1], 0.010101020336151123, 1e-6)
  
file_path: essentia/test/src/unittests/sfx/test_derivativesfx_streaming.py
imports: from essentia_test import *
  from essentia.streaming import DerivativeSFX
label_desc: Use image node_id 6 for calling the TestDerivativeSfx_Streaming obj's underlying member method code with example usage: obj.testRegression() without return types